ulysses-you commented on pull request #32683:
URL: https://github.com/apache/spark/pull/32683#issuecomment-852188051


   @maropu  After taking a deep look, I think it's about compression ratio that 
the extreme case @JkSelf  metioned above.
   
   Here is some pictures of `q72`.  We can see the 60MB data contains 
4.9million rows.
   
   
![image](https://user-images.githubusercontent.com/12025282/120342780-b1905100-c32a-11eb-8156-32a0e8edf199.png)
   


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